Thomas Ellermann posted a great breakdown on the updates in R2 for Service Manager 2012. The focus in R2 for Service Manager was to tackle some of the critical customer and MVP collected bugs. Service Managers R2 release saw no major performance improvements but we are targeting Console and Portal performance in the next update (UR) cycles. With that in mind a few of the R2 fixes are associated to improving console and workflow stability, and that can help a great deal with performance.
You can find Thomas’s post here: http://blogs.technet.com/b/thomase/archive/2013/10/29/service-manager-2012-r2-fixes-included.aspx
Christian Booth (ChBooth) | Sr. Program Manager | System Center